Time Zones on exadata located at different locations

We have a situation where our Oracle databases are going to be located at different geographical locations. ( platform: Oracle sun database machine, eXadata).
We have data loaded into these databases from all over the world too.
***Not sure what time zone we will set at each location, no idea, but thinking of GMT at each location.
-1-
Question is, how do we do that on ODM ?
-2-
Where do we need to apply this change ?
-3-
Storage Cell Level ? OR
-4-
Database Level on each Node ?
-5-
Do I need to worry about day light savings ?
-6-
What is the impact of 'GMT' timezone onto client session from different locations?

munno,
I don't think your question is specific to Database Machine or Exadata at all. The same questions arise any time there are two servers in different time zones that service the same application. The answers are specific to your application and database configuration. If you use the TIMESTAMP data types that include timezone, it shouldn't matter. Unfortunately, most customers aren't using these types. The data in the database shouldn't change based on where the database server is located IMO - the application should insert the data with whatever time it wants/needs.
Changing the time zone on storage cells requires you to run the ipconf utility. Changing the database server time zone is done just like any other Linux server - nothing special there and there are many good doc sources for that that any competent Linux administrator should be able to find if they don't already know.
Hope that directs you to the answers you need.

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